Pneumatic motor for piano-players



y C.E.PE1ERS0N. PNEUMATLC MOTOR FOR PIANO PLAYERS.

APPLlCATION FILED MAY 15, |918. l

rmrrEE sraTEs PATENT oEEroE.

CLAUS E. PETERSON, OF IVORCESTER, MASSACHUSETTS, ASSIGNOR TO IVERSONPIANO PLAYER COMPANY, OF BOSTON, MASSACHUSETTS', A CORPORATION OFMASSACHU- SETTS.

PNEUMATIC MOTOR FOR PIANO-PLAYERS.

Specification of Letters Patent.

' Patented Jan. 13, 1920.

Application filed May 15, 1918. Serial No. 234,702.

To all 'whom it may concern:

Be it known that I, CLAUS E. PETERSON, a citizen of the United States,residing at Worcester, in the county of Worcester and Commonwealth ofMassachusetts, have invented a new and useful improvement in PneumaticMotors for Piano-Players, of which the following, together with theaccompanying drawings, is a specification.

My present invention relates to certain details in the operativeconnection between the valves of the motor and the motor bellows;further, to the construction of the guides for the valves, and also toreduce the number of valves required to operate the motor bellows. Thepreferred embodiment of my invention is illustrated in the accompanyingdrawings, the novel features being pointed out in the annexed claims.

Figure 1 is a front elevation of one of my improved motors for pianoplayers.

Fig. 2 is a side view shown in section on the planeof the broken line2-2, Fig. 1.

Fig. 3 is a side elevation of one of the controlling valves shown insectional view on the plane of the broken line 3 3, Fig. 1.

Fig. 4 is a transverse sectional view of two of the motor bellows shownin section on the plane of the broken line 4-4, Fig. 1.

Fig. 5 is a transverse sectional view of two of the motor bellows on theplane of the broken line 55, Fig. 1.

Similar reference characters refer to similar parts in the differentfigures.

The motor shown in Fig. 1 consists of six motor bellows, numbered 1, 2,3, 4, 5 and 6, while the number of valves controlling the action ofthese bellows is reduced to three, numbered respectively, 7, 8 and 9.The valves 7, 8, and 9 are constructed as usual in instruments of thisclass having end pieces 10, 10, as shown in sectional view in Fig. 3,side pieces 11, 11, shown in sectional view in Fig. 5, and a cover ortop piece 12 of some impervious material, such, for example, as rubbercloth, forming a pocket 122L open upon the under side and adapted toslide upon a raceway 13. In order to hold the valves in position I placepins 14 in the thick end pieces of the valve projecting a short distancefrom the sides 11 of the valve, and over the pins I place annularwashers 15. In the raceways 13 I insert wire staples 16 which extend theentire length of the raceway over the pins 14. In order to remove thevalves I spring the staples 16 apart slightly to allow the pins 14 topass them. The raceways 13 are formed upon the tops of wind chests 17,17 17, constituting wind chests for the motor bellows 2, 4, and 6.Between the wind chests 17, 17, 17, I place wind chests 18, 18, 18,connected with the motor bellows 1, 3 and 5. Passing transverselythrough four of the wind chests upon the right hand side of the motorare air passages 19, connected by pipes 20 forming a continuous passageterminating at one end in a port 21, and connected at the opposite endby means of a pipe 22 with an exhaust bellows. Each of the racewaysn13which are provided with the sliding valves 7, 8 and 9 are provided withports 21, 23,

24, 25, 26, 27, 28, 29, and 30. The ports 23,v

25, and 28 are connected by pipes 31, and passages 32, with openings 33leading to the motor bellows 1, 3 and 5. Each of the motor bellows isconnected by a pitman 34 with a crank shaft 35, journaled in brackets 36attached to the outer motor bellows. A sliding motion is given toeach ofthe valves 7, 8 and 9 by a connection with the pitmen 34 consisting of awire pitman 37 which is hooked at one end through an opening 38 in thepitmen 34. The opposite ends of the wires 37 are screwthreaded and carryblocks 39 held between the nuts 40, 40, making a rigid connectionbetween the blocks 39 and the wires 37. The blocks 39 are pivoted uponstaples 41, held in the end pieces 10 of the valves. It will be notedthat the number of valves employed is only one half the number of motorbellows.

The operation of the motor is as fol-y lows z-Air having been exhaustedthrough the pipe 22 from the central transverse passage communicatingwith the several ports 21, 26, and 29 with the valves 7, 8 and 9 in theposition shown, a communication will be established by the valve 7between the ports 21 and 24, causing the port 24 to exhaust air from themotor bellows 2 through the port 21 to the exhaust mechanism, the motor2 will therefore be collapsed by the exhaustion of air therefrom, whilethe port 23, being open, will admit air to the motor bellows 1, whichwill become expanded. In the position of the valve 8 communication isestablished between the the opposite sides of the valve near its ends,pol-ts 25 and 26 which will exhaust air' from and a pair of elongatedstaples extending the Inotoi` bellows 3, while the port 27 being thelength of the iaceway and passing over open, and communicating with themotor said pins.

5 bellows l, will cause the lattei1 to be eX-y 2. In an apparatus of theclass described, 20 panded. The position of the valve 9 will incombination, a raoeway for a valve, a cause the inotol` bellows 5 to becollapsed and reciprocating Valve, pins projecting' from the motorbellows G to be expanded. The the sides of the valve near each of itsends, Crank shaft 85 is arranged to ploduoe the de ieXible washers heldon said pins, and a pair 10 sired succession of operations in thernotoi' oil* elongated staples held .in said raoeway 25 bellows. andextending' over said pins.

I claim, CLAUS EPETERSOW. l. In an apparatus of the class described,Witnessesr in combination, a raoeway for a Valve, a NELLIE VHALEN,

15 reciprocating valve, pins projecting from PENELOPE COMBERBACH.

